Classification of Elements & Periodicity in Properties Test 13

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Classification of Elements & Periodicity in Properties Test 13

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Weekly Quiz Competition

Question 1
1 / -0

Match the atomic numbers given in column I with the block in which the element is placed in colurim II and mark the appropriate choice.

A
(A) → (iii), (B) → (i), (C) → (iv), (D) → (ii)

B
(A) → (i), (B) → (ii), (C) → (iii), (D) → (iv)

C
(A) → (ii), (B) → (iv), (C) → (i), (D) → (iii)

D
(A) → (iv), (B) → (i), (C) → (ii), (D) → (iii)

Solution

(A) Z = 62; 4f⁶5d° 6s² (f-block)
(B) Z = 47; 4d¹⁰5s¹(d-block)
(C) Z=56; 6s² (s-block)
(D) Z = 53 ; 5s² 5p⁵ (p-block)
Question 2
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Atomic numbers of few elements are given below. Which of the pairs belongs to s-block?

A
7, 14

B
3, 20

C
8, 15

D
9, 17

Solution

Z = 3; 1s² 2s¹ ; Z = 20; 1s² 2s²2p⁶3s² 3p⁶ 4s²
Question 3
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Which of the following have the same number of electrons in outermost shell?

A
Elements with atomic numbers 30,48, 80

B
Elements with atomic numbers 14, 15,16

C
Elements with atomic numbers 20, 30, 50

D
Elements with atomi numbers 10, 18, 26

Solution

Element with atomic number 30 ; [Ar] 3d¹⁰ 4s²
Element with atomic number 48 ; [Kr] 4d¹⁰ 5s²
Element with atomic number 80; [Xe] 4f¹⁴5d¹⁰6s²
Question 4
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An element has the electronic configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁸ 4s².
What will be its position in.the periodic table?

A
Period 4, Group 10

B
Period 2, Group 2

C
Period 4, Group 2

D
Period 2, Group 8

Solution

n = 4 hence, element lies in 4^th period.
Group number = ns + (n - 1)d = 2 + 8 =10
Question 5
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Fill in the blanks bypicking the correct option.
There are _____ groups and _____ periods in the extended form of periodic table. The group, all members of which are in gaseous state under ordinary conditions is _____ group. Most electropositive elements belong to _____ group.

A
16, 8, 17, 2

B
18, 7, 18, 1

C
8, 7, 0, 2

D
16, 8, 18, 1

Solution

There are 18 groups and 7 periods in periodic table. All members of 18^thgroup are noble gases and first group contains alkali metals which are the most electropositive.
Question 6
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Examples of elements belonging to s, p, d or f-block are given below. Identify the wrong example,

A
s-block element - Caesium

B
p-block element - Barium

C
d-block element - Chromium

D
f-block element - Thorium

Solution

Barium belongs to s-block with an outer configuration 6s².
Question 7
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Electronic configurations of few elements are given below. Mark the incorrect match.

A
1s² 2s²2p⁵ - Most electronegative element

B
1s² 2s² 2p³ - An element belonging to 3^rd period and 5^th group

C
1s² 2s² 2p⁶ 3s² 3p⁶3d⁸4s² - A d-block element

D
1s² 2s²2p⁶3s² 3p⁶ - An element from 18^th group

Solution

Since n = 2 it belongs to 2^nd period.
Question 8
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Few general names are given along with their valence shell configurations. Mark the incorrect name.

A
ns² np⁶ - Noble gases

B
ns² np⁵ - Halogens

C
ns¹ - Alkali metals

D
ns² np² - Chalcogens

Solution

ns² np² are members of carbon family.
Chalcogens is the general name of 16^th group elements.
Question 9
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Electronic configuration of four elements is given below. Which of the following does not belong to the same group?

A
[Kr] 4d¹⁰5s²

B
[Ar] 3d¹⁰4s²

C
[Xe] 5p⁶6s²

D
[Xe]4f¹⁷5d¹⁰6s²

Solution

It belongs to p-block while other elements belong to d-block and same group.
Question 10
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There are two rows of inner transition elements in the periodic table each containing 1414 elements. The reason for this may be

A
F-orbital has seven values for magnetic quantum number, hence total electrons are 14

B
In the periodic table there is space to accommodate 14 electrons only

C
Only 28 inner transition elements have been discovered till date

D
28 is the maximum number of elements that any block can accommodate

Solution

For f-orbital, l = 3, m_l= 2l + 1 = 7
There are 7 electrons with +1/2 spin and 7 electrons with -1/2 spin. Hence, total electrons are 14.
Question 11
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Part of the periodic table showing p-block is depicted below. What are the elements shown in the zig-zag boxes called? What is the nature of the elements outside this boundary on the right side of the table?

A
Transition elements, metalloids

B
Metalloids, non-metals

C
Metals, non-metals

D
Non-metals, noble gases

Solution

Metalloids are shown by the zig-zag boxes and the elements preseht on the right side of the boundary are non-metals. Metals are present on the left side of the periodic table.
Question 12
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The electronic configuration of few elements is given below. Mark the statement which is not correct about these elements.
(i) 1s²2s²2p⁶3s¹
(ii) 1s²2s²2p⁵
(iii) 1s²2s²2p⁶
(iv) 1s²2s²2p³

A
(i) is an alkali metal

B
(iii) is a noble metal

C
(i) and (ii) form ionic compounds

D
(iv) has high ionisation enthalpy

Solution

(i) is an alkali metal. It readily loses an electron to attain a noble gas configuration.
(iii) is a noble gas. It has completed its octet.
Highly electropositive (i) and highly electronegative (ii) form ionic compounds.
(iv) has high ionization enthalpy as removal of an electron will break half-filled 2p subshell.
Question 13
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Which of the following is not correct statement for periodic classification of elements?

A
The properties of elements are the periodic functions of their atomic number

B
Non-metallic elements are less in number than metallic elements

C
For transition elements, the last electron enters into (n - 2) d-subshell

D
None of these

Solution

In the periodic classification of elements: The properties of elements are the periodic functions of their atomic number. Non-metallic elements are less in number than metallic elements. For transition elements, the last electron enters into (n - 1) d-subshell.
Question 14
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Indicate the wrong statement on the basis of the periodic table.

A
The most electronegative element in the periodic table is fluorine

B
Scandium is the first transition element and belongs to fourth period

C
There are four transition series in the periodic table each containing 10 elements

D
Along a period halogens have maximum negative electron gain enthalphy

Solution

There are three transition series,each containing 10 elements.The fourth has incomplete position hence discussed with f-Block elements
Question 15
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Which is the most non-metallic element among the following?

A
1s²2s²2p⁶3s¹

B
1s²2s²2p⁵

C
1s²2s²2p⁶3s²

D
1s²2s²2p³

Solution

It contains maximum number of electrons in the outermost shell. An element with more than 3 electrons in outermost shell is non-metallic.

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Classification of Elements & Periodicity in Properties Test 13

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Classification of Elements & Periodicity in Properties Test 13

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Question 1

(A) → (iii), (B) → (i), (C) → (iv), (D) → (ii)

(A) → (i), (B) → (ii), (C) → (iii), (D) → (iv)

(A) → (ii), (B) → (iv), (C) → (i), (D) → (iii)

(A) → (iv), (B) → (i), (C) → (ii), (D) → (iii)

Solution

Question 2

7, 14

3, 20

8, 15

9, 17

Solution

Question 3

Elements with atomic numbers 30,48, 80

Elements with atomic numbers 14, 15,16

Elements with atomic numbers 20, 30, 50

Elements with atomi numbers 10, 18, 26

Solution

Question 4

Period 4, Group 10

Period 2, Group 2

Period 4, Group 2

Period 2, Group 8

Solution

Question 5

16, 8, 17, 2

18, 7, 18, 1

8, 7, 0, 2

16, 8, 18, 1

Solution

Question 6

s-block element - Caesium

p-block element - Barium

d-block element - Chromium

f-block element - Thorium

Solution

Question 7

1s2 2s2 2p5 - Most electronegative element

1s2 2s2 2p3 - An element belonging to 3rd period and 5th group

1s2 2s2 2p6 3s2 3p6 3d8 4s2 - A d-block element

1s2 2s2 2p6 3s2 3p6 - An element from 18th group

Solution

Question 8

ns2 np6 - Noble gases

ns2 np5 - Halogens

ns1 - Alkali metals

ns2 np2 - Chalcogens

Solution

Question 9

[Kr] 4d105s2

[Ar] 3d10 4s2

[Xe] 5p6 6s2

[Xe]4f175d106s2

Solution

Question 10

F-orbital has seven values for magnetic quantum number, hence total electrons are 14

In the periodic table there is space to accommodate 14 electrons only

Only 28 inner transition elements have been discovered till date

28 is the maximum number of elements that any block can accommodate

Solution

Question 11

Transition elements, metalloids

Metalloids, non-metals

Metals, non-metals

Non-metals, noble gases

Solution

Question 12

(i) is an alkali metal

(iii) is a noble metal

(i) and (ii) form ionic compounds

(iv) has high ionisation enthalpy

Solution

1s² 2s²2p⁵ - Most electronegative element

1s² 2s² 2p³ - An element belonging to 3^rd period and 5^th group

1s² 2s² 2p⁶ 3s² 3p⁶3d⁸4s² - A d-block element

1s² 2s²2p⁶3s² 3p⁶ - An element from 18^th group

ns² np⁶ - Noble gases

ns² np⁵ - Halogens

ns¹ - Alkali metals

ns² np² - Chalcogens

[Kr] 4d¹⁰5s²

[Ar] 3d¹⁰4s²

[Xe] 5p⁶6s²

[Xe]4f¹⁷5d¹⁰6s²

1s²2s²2p⁶3s¹

1s²2s²2p⁵

1s²2s²2p⁶3s²

1s²2s²2p³